Critical velocity experiments in space

Details Critical velocity experiments in space Critical velocity experiments in space

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983esasp.195..215m&link_type=abstract

In ESA Active Expts. in Space p 215-226 (SEE N84-14172 05-12)

Physics

Critical Velocity, Gas Ionization, Spaceborne Experiments, Earth Ionosphere, Gas Discharges, Ion Production Rates, Momentum Transfer, Plasma Heating, Plasma Jets, Solar Wind Velocity, Velocity Distribution

Scientific paper

Critical ionization velocity experiments in space are discussed. The high relative velocity of the neutral gas with respect to the ambient plasma is produced in three different ways. In one group of experiments gas jets with speeds of the order of 10 km/sec are produced by shaped charges with Ba or Sr. The second uses the high velocity of orbiting spacecraft; the third is based on the high flow velocities in the upper magnetosphere and the solar wind. The experiments show that the Townsend condition is the most critical restriction for fast gas jets and gas releases in the ionosphere while mass loading and diamagnetic effects are the main restrictions for releases in the flowing plasmas of the upper magnetosphere and the solar wind.

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